Re: [TrouSerS-users] TSS_TSPATTRIB_POLICY_POPUPSTRING not working

[Kent Y. <shp...@gm...>]

Hi Hal,

On 9/23/07, Hal Finney <hal...@gm...> wrote:
> Having switched to using TSS_SECRET_MODE_POPUP in some of my tests, I
> decided to try the TSS_TSPATTRIB_POLICY_POPUPSTRING feature which lets
> you modify the prompt string that gets displayed in the popup. However
> it is not working. The test program below pops up a dialog whose
> prompt string is just "a" when it should be "abc". If I change to
> using 8 bit chars instead of 16 bit, then the prompt string is
> completely blank. But I think from reading the spec it is stupposed to
> be 16 bit chars.
>
> Hal
>
>
>
> /* Demo bug that TSS_TSPATTRIB_POLICY_POPUPSTRING doesn't display right */
>
> #include <stdio.h>
> #include <trousers/tss.h>
>
> #define CKERR   if (result != TSS_SUCCESS) goto error
>
> int
> main ()
> {
>         TSS_HCONTEXT    hContext;
>         TSS_HTPM        hTPM;
>         TSS_HPOLICY     hTpmPolicy;
>         TSS_HKEY        hKey;
>         wchar_t         popupString[] = L"abc";

  wchar_t is 4 bytes wide for me...  Changing the above line to:

TSS_UNICODE         popupString[] = { 'a', 'b', 'c', 0 };

works though.  I don't know of a simpler way to specify a 2-byte wide
string at this point, please post if you find a way...

Kent

>         int             result;
>
>         result = Tspi_Context_Create(&hContext); CKERR;
>         result = Tspi_Context_Connect(hContext, NULL); CKERR;
>         result = Tspi_Context_GetTpmObject(hContext, &hTPM); CKERR;
>         result = Tspi_Context_CreateObject (hContext, TSS_OBJECT_TYPE_POLICY,
>                 TSS_POLICY_USAGE, &hTpmPolicy); CKERR;
>         result = Tspi_Policy_SetSecret(hTpmPolicy,
> TSS_SECRET_MODE_POPUP, 0, NULL); CKERR;
>         result = Tspi_SetAttribData(hTpmPolicy,
> TSS_TSPATTRIB_POLICY_POPUPSTRING, 0,
>                                 sizeof(popupString), (BYTE
> *)popupString); CKERR;
>         result = Tspi_Policy_AssignToObject(hTpmPolicy, hTPM); CKERR;
>         result = Tspi_TPM_GetPubEndorsementKey (hTPM, TRUE, NULL, &hKey); CKERR;
>
>         printf ("Success!\n");
>         return 0;
>
> error:
>         printf ("Failure, error code: 0x%x\n", result);
>         return 1;
> }
>
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-- 
Kent Yoder
IBM LTC Security Dev.